Study of the cardiac arrhythmias by the ultrasonic Doppler method.
D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D001281:Atrial Fibrillation / Q000175:diagnosis; D001282:Atrial Flutter / Q000175:diagnosis; D001919:Bradycardia / Q000175:diagnosis; D006327:Heart Block / Q000175:diagnosis; D006334:Heart Function Tests; D006801:Humans; D008722:Methods; D013610:Tachycardia / Q000175:diagnosis; D014463:Ultrasonography